output
19932026
Showing 2017 · astro-ph.SRShow all

72 papers · 2 filters

astro-ph.SR2017★ 52 cited

Mass and Age of Red Giant Branch Stars Observed with LAMOST and \emph{Kepler}

Yaqian Wu, Maosheng Xiang, Shaolan Bi +13

Obtaining accurate and precise masses and ages for large numbers of giant stars is of great importance for unraveling the assemblage history of the Galaxy. In this paper, we estima…

astro-ph.SR2017★ 50 cited

The benchmark halo giant HD 122563: CNO abundances revisited with three-dimensional hydrodynamic model stellar atmospheres

Remo Collet, Åke Nordlund, Martin Asplund +2

We present an abundance analysis of the low-metallicity benchmark red giant star HD 122563 based on realistic, state-of-the-art, high-resolution, three-dimensional (3D) model stell…

astro-ph.SR2017★ 24 cited

Gravity mode offset and properties of the evanescent zone in red-giant stars

S. Hekker, Y. Elsworth, G. C. Angelou

The wealth of asteroseismic data for red-giant stars and the precision with which these data have been observed over the last decade calls for investigations to further understand…

astro-ph.SR2017★ 3 cited

Using the phase shift to asymptotically characterize the dipolar mixed modes in post-main-sequence stars

C. Jiang, J. Christensen-Dalsgaard, M. Cunha

Mixed modes have been extensively observed in post-main-sequence stars by the Kepler and CoRoT space missions. The mixture of the p and g modes can be measured by the dimensionless…

astro-ph.SR2017★ 34 cited

Low-frequency photospheric and wind variability in the early-B supergiant HD 2905

S. Simón-Díaz, C. Aerts, M. A. Urbaneja +5

Despite the important advances in space asteroseismology during the last decade, the early phases of evolution of stars with masses above 15 M have been only vaguel…

astro-ph.SR2017★ 69 cited

Modelling Kepler Red Giants in Eclipsing Binaries:Calibrating the Mixing Length Parameter with Asteroseismology

Tanda Li, Timothy R. Bedding, Daniel Huber +4

Stellar models rely on a number of free parameters. High-quality observations of eclipsing binary stars observed by Kepler offer a great opportunity to calibrate model parameters f…

astro-ph.SR2017★ 50 cited

SN 2017dio: a type-Ic supernova exploding in a hydrogen-rich circumstellar medium

Hanindyo Kuncarayakti, Keiichi Maeda, Christopher J. Ashall +42

SN 2017dio shows both spectral characteristics of a type-Ic supernova (SN) and signs of a hydrogen-rich circumstellar medium (CSM). Prominent, narrow emission lines of H and He are…

astro-ph.SR2017★ 107 cited

Finding binaries from phase modulation of pulsating stars with Kepler: V. Orbital parameters, with eccentricity and mass-ratio distributions of 341 new binaries

Simon J. Murphy, Maxwell Moe, Donald W. Kurtz +3

The orbital parameters of binaries at intermediate periods (-- d) are difficult to measure with conventional methods and are very incomplete. We have undertaken a new s…

astro-ph.SR2017★ 82 cited

The influence of metallicity on stellar differential rotation and magnetic activity

Christoffer Karoff, Travis S. Metcalfe, Angela R. G. Santos +20

Observations of Sun-like stars over the last half-century have improved our understanding of how magnetic dynamos, like that responsible for the 11-year solar cycle, change with ro…

astro-ph.SR2017★ 130 cited

Theory and evidence of global Rossby waves in upper main-sequence stars: r-mode oscillations in many Kepler stars

Hideyuki Saio, Donald W. Kurtz, Simon Murphy +2

Asteroseismic inference from pressure modes (p modes) and buoyancy, or gravity, modes (g modes) is ubiquitous for stars across the Hertzsprung--Russell diagram. Until now, however,…

astro-ph.SR2017★ 4 cited

Stellar evolution and modelling stars

Víctor Silva Aguirre

In this chapter I give an overall description of the structure and evolution of stars of different masses, and review the main ingredients included in state-of-the-art calculations…

astro-ph.SR2017★ 1 cited

Asteroseismology of red giants & galactic archaeology

Saskia Hekker

Red-giant stars are low- to intermediate-mass (~M) stars that have exhausted hydrogen in the core. These extended, cool and hence red stars are key targets…

astro-ph.SR2017★ 6 cited

An Introduction to Data Analysis in Asteroseismology

Tiago L. Campante

A practical guide is presented to some of the main data analysis concepts and techniques employed contemporarily in the asteroseismic study of stars exhibiting solar-like oscillati…

astro-ph.SR2017★ 137 cited

The First APOKASC Catalog of Kepler Dwarf and Subgiant Stars

Aldo Serenelli, Jennifer Johnson, Daniel Huber +23

(Abridged) We present the first APOKASC catalog of spectroscopic and asteroseismic data for 415 dwarfs and subgiants. Asteroseismic data have been obtained by Kepler in short caden…

astro-ph.SR2017★ 14 cited

A cautionary tale of interpreting O-C diagrams: period instability in a classical RR Lyr Star Z CVn mimicking as a distant companion

M. Skarka, J. Liška, R. Dřevěný +4

We present a comprehensive study of Z CVn, an RR Lyrae star that shows long-term cyclic variations of its pulsation period. A possible explanation suggested from the shape of the O…

astro-ph.SR2017★ 79 cited

High-precision abundances of elements in Kepler LEGACY stars. Verification of trends with stellar age

P. E. Nissen, V. Silva Aguirre, J. Christensen-Dalsgaard +3

HARPS-N spectra with S/N > 250 and MARCS model atmospheres were used to derive abundances of C, O, Na, Mg, Al, Si, Ca, Ti, Cr, Fe, Ni, Zn, and Y in ten stars from the Kepler LEGACY…

astro-ph.SR2017★ 41 cited

Model-independent measurement of internal stellar structure in 16 Cygni A and B

Earl P. Bellinger, Sarbani Basu, Saskia Hekker +1

We present a method for measuring internal stellar structure based on asteroseismology that we call "inversions for agreement." The method accounts for imprecise estimates of stell…

astro-ph.SR2017★ 36 cited

The masses of retired A stars with asteroseismology: Kepler and K2 observations of exoplanet hosts

Thomas S. H. North, Tiago L. Campante, Andrea Miglio +7

We investigate the masses of "retired A stars" using asteroseismic detections on seven low-luminosity red-giant and sub-giant stars observed by the NASA Kepler and K2 Missions. Our…

astro-ph.SR2017★ 24 cited

Theoretical oscillation frequencies for solar-type dwarfs from stellar models with -atmospheres

Andreas Christ Sølvsten Jørgensen, Achim Weiss, Jakob Rørsted Mosumgaard +2

We present a new method for replacing the outermost layers of stellar models with interpolated atmospheres based on results from 3D simulations, in order to correct for structural…

astro-ph.SR2017★ 1 cited

The γ Dor stars as revealed by Kepler : A key to reveal deep-layer rotation in A and F stars

S. J. A. J. Salmon, R. -M. Ouazzani, V. Antoci +2

The γ Dor pulsating stars present high-order gravity modes, which make them important targets in the intermediate-and low-mass main-sequence region of the Hertzsprung-Russell diagr…

astro-ph.SR2017★ 4 cited

Spatial incoherence of solar granulation: a global analysis using BiSON 2B data

Mikkel N. Lund, William J. Chaplin, Steven J. Hale +3

A poor understanding of the impact of convective turbulence in the outer layers of the Sun and Sun-like stars challenges the advance towards an improved understanding of their inte…

astro-ph.SR2017★ 50 cited

The GALAH survey: Chemical Tagging of Star Clusters and New Members in the Pleiades

Janez Kos, Joss Bland-Hawthorn, Ken Freeman +25

The technique of chemical tagging uses the elemental abundances of stellar atmospheres to `reconstruct' chemically homogeneous star clusters that have long since dispersed. The GAL…

astro-ph.SR2017★ 78 cited

Beyond the Kepler/K2 bright limit: variability in the seven brightest members of the Pleiades

T. R. White, B. J. S. Pope, V. Antoci +20

The most powerful tests of stellar models come from the brightest stars in the sky, for which complementary techniques, such as astrometry, asteroseismology, spectroscopy, and inte…

astro-ph.SR2017★ 96 cited

Light and color curve properties of type Ia supernovae: Theory vs. Observations

P. Hoeflich, E. Y. Hsiao, C. Ashall +10

We study optical light curve(LC) relations of type Ia supernovae(SNe~Ia) for their use in cosmology using high-quality photometry published by the Carnegie-Supernovae-Project (CSP-…